ARM sched model: Add VFP div instruction on Swift

Reapply 183271.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183472 91177308-0d34-0410-b5e6-96231b3b80d8
ARM sched model: Use the right resources for DIV

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183477 91177308-0d34-0410-b5e6-96231b3b80d8